Trustees



(No Model.) I

A. L. PARCELLE. PEBDNG MEGHANISM PQR SEWING MACHINES. No. 247,399. Patented Sept. 20,1881.

' UNITED STATES PATENT OEEicEo ALBERT L. PAROELLE, OF BOSTON, ASSIGNOR TO A. B. OOFFIN, OF WIN- CHESTER, ONSLOV GILMORE, OF STONEHAM, rAND BENJAMIN A. FOW- LER, OF STONEHAM, MASSACHUSETTS, TRUSTEES.

FEEDING MECHANISM FOR SEWING-MACHINES.

SPECIFICATION forming part of Letters Patent No. 247,399, datedSeptember 20, 1881.

Application filed March 1, 1881. (No model.)

To all whom fit may concern Be it known thatl, ALBERT L. PARGELLE, of Boston, in the county of Suffolk and State of Massachusetts, have invented 'certain Improvements in Feed-Operating Mechanism for Sewing-Machines, of which the following is a specification.

This invention relates to four-motion feeds for sewing-machines in which the longitudinal 1o and vertical movement of the feed-dog are effected by two positively-rotating cams working on a common drivingshaft between and upon abutmenls projecting from the stock or bar of the feed-dog.

The invention has for its object, first, to provide improved mechanism i'or reversing the direction of the feed movements while the machine is in operation, if so desired; and, secondly, to provide improved mechanism for vazo rying the length ofthe feed movement and of the stitch produced by the machine.

To these ends my invention consists, first, in the provision of means whereby the operator may change the position of the cam which moves the feed-dog longitudinally without affectin g the cam which moves the dog vertically, so that the longitudinal movement imparted by the first-named cam to the feed-dog when the latter is raised to'move the work will 3o be reversed Without interfering with the vertical movement of the feed-dog.

The invention consists, also, in certain details of construction and combinations of parts, whereby the desired results are attained, all

3 5 of which I will now proceed to describe and claim.

Of the accompanying drawings, forming part of this specification, Figure 1 represents a top view of the mechanism embodying my 4o invention, the bed of the sewing-machine being removed. Fig. 2 represents an end view of the same, showing also the bed ot' themachine, the presser-foot, the needle, and a portion of the needle-bar. Fig. 3 represents a section on 4 5 Aline w w, Fig. 2. Figs. 4, 5, and 6 represent, respectively, sections on lines a' x, y y, and z z, Figs. 2 and 3. Fig. 7 represents a section on line x wf, Fig. 1.

The same letters ot' reference indicate the same parts in allA the figures. 5o

In the drawings, a represents the feed-dog, having feed-teeth adapted to operate alike in moving in two opposite directions.

b represents the stock or bar supporting the feed-dog, and adapted to move vertically and longitudinally. The stock or bar b is, in this instance, provided with trnnnions b b', inserted in elongated sockets c c formed in blocks d d on the under side of the bed e, said trunnions being adapted to rotate and to move lat- 6o erally in their sockets, thus enabling the stock or bar to oscillate in a vertical plane and to reciprocate longitudinally.

ff represent downwardly-projecting abutlnents on the stock or bar b, more fully described hereinafter, and g represents an abutment on the under side ot' the stock or bar.

h represents the cam which moves the bar b and feed-dog a longitudinally, said cam being rotated by a driving-shaft, j, and located 7o between the abutmentsff. i represents the cam which moves the bar b and feed-dog a vertically, said cam being also rotated by the shaft j and bearing against the abutment g. The

cams h z' are arranged to give the feed-dog its 75 usual four motions, and their operation on the stock or bar b need not beminutely described.

In carrying out the first part of my invention-viz., providing means for reversing the direction ot the feed movement, or, in other 8o words, the longitudinal movement of the feeddog, While the latter is raised to engage with the work--I interpose between the shaft j and the cams lm' a sleeve, 7c, which is connected to said shaft by a feather, and is therefore ro- 8 5 cated by the shaft and adapted to slide longi* tudinally thereon. The sleeve kpassesloosely through apertures in the cams h t', and is provided with a curved slot, m, extending from a point near one end of the sleeve to a diametri- 9o cally-opposite point near the other end of the sleeve, and a straight slot, n, parallel with the axial line of the sleeve. A stud, 0, rigidly attached to the cam h, projects into the curved slot m, and a stud, p, similarly attached to the cam i, projects into thestraight slotn.

It will be seen that the sleeve k, which is rotated by the shaft j, is engaged, by means of the slots m n and studs op, with the cams h i, so that said cams will rotate with the sleeve and shaft. It will also be seen that when the sleeve is moved longitudinally on the shaft one side of the curved slot bearing on the stud o will partially rotate the cam h independently of the sleeve and shaft, so that if the stud o is at one end of the slot m when the sliding movement is commenced the cam will be semi-rotated by the time the other end of the slot m reaches the stud o. At the same time the sliding movement of the sleeve has no effect on the cam i, because the slot n, with which the stud p of said cam is engaged, is

parallel with the line of movement of the sleeve.

The cam 7L is arranged to move the raised feed-dog in one direction when the stud o is at one end of the slot m, and in the opposite direction when the stud o is at the opposite end of the slot m. Hence the direction of the feed movement is reversed by each complete longitudinal movement of the sleeve 7c. The cams h t' are supported laterally, so that they will not be displaced laterally by the longitudinal movement ofthe sleeve k, by arms r r, attached to the bed of the machine, the shaft j and sleeve 7c passing through orifices in said arms.

s represents abar or rod adapted to slide in guides on the under side of the bed c, and provided With a forked arm, s', engaging with a groove in the periphery of the sleeve 7c. The rod s may be provided with an operating handle or knob Within 'convenient reach of the operator, or otherwise adapted to be operated.

It is obvious that the cam fi is not necessarily placed on the sleeve 7c, but may be rigidly attached to the shaft]- ata point sufficiently distant from the sleeve k to permit the longitudinal movement of said sleeve. In case the cam fi were attached to the shaft, as last described, the abutment g would have to be correspondingly set off from the stock or bar b, and the slotn in the sleeve 7c would be omitted. I find it more convenient, however, to place the cam t' on the sleeve k, as shown.

In carrying out the second part of my invention-viz., providing means for varying the abutments ff', and thereby varying the length of the stitches-I attach the abutment f rigid] y to the stock b, and connect the abutment f to the stock in such manner that the lastnamed abutment can slide on the stock toward and from the abutment j'. In the present instance the abutment f is connected to the stock by means of a screw or pin, t, passing from the stock through a slot, u, in the abutment.

t represents a rotary shaft, `iournaled at one end in an arm, w, forming a part of the stock or bar b, and journaled at the other end in the movable abutment f The shaft c has a screwthreaded portion, e', which passes through a correspondiugly-threaded socket in the iiXed abutment f. When the shaft fu is rotated its threaded portion t and the threaded socket cause said shaft to move longitudinally. Collars t2 c2 on the shaft, at opposite sides of the abutment f cause said abutment to move with the shaft c, so that by the movement of said shaft the abutment f is moved toward or from the abutment j', and the longitudinal movement of the feed-dog produced by the action of the cam hon the abutmentsff' is increased or diminished, and consequently the length of 7 5 the stitches produced by the machine is regulated.

To enable the operator to conveniently rotate the shaftl c, I provide a bar, A, adapted to slide in guides in the bottom of the bed of the machine, and provided With a rack, B, enga gin gvvith a pinion, C, attached to the shaft e. The rack B is of sufficient Width to enable the pinion G to move with the shaft a in regulating the stitches Without becoming disengaged from the rack. y The bar A may have an operating handle or knob projecting above the bed of the machine, and suitable marks of graduations may be provided to indicate the position of the bar Arequired for the adjustment of the feed to produce stitches of a given length.

I do not limit myself to the employment of the rack and pinion, nor any special mechanism to rotate the shaft t, as any suitable means may be used 5 or said shaft may be rotated by the hand of the operator, a suitable knob or handle being formed on the shaft.

My invention thus described is lextremely simple and effective, and in these respects it has advantages over any mechanisms for the same purposes with which I am acquainted.

Having thus described my invention, what I claim, and desire to secure by Letters Patent, is-

1. The combination of the four motioned feed-dog, the supporting stock or bar having abutments f,f, and g, tWo cams, h t', rotated by y the same shaft, and adapted, respectively, to

move the dog horizontally and vertically, and means for changing the position of the cam h without affecting the cam t', whereby the direction of the feed movement is reversed Without interference with the vertical movement, as set forth.

2. The combination of afour-motioned .feeddog, carried by a stock or bar, a cam, for

raising and lowering said dog, and the mechanism for longitudinally moving and reversing the feed movement of the dog, consisting of a driving-shaft,j, a sleeve, k, rotating with and adapted to slide upon the driving-shaft, a laterally-supported cam, 71 placed loosely on the sleeve 7c, engaged with a curved slot in said sleeve and adapted to bear upon abutments ff on the feed stock or bar, and a device, controlled by the operator, for sliding the sleeve on its shaft, and thereby changing the position ofthe cam, so that it will reverse the direction of the feed movement of the feed-dog, as set forth.

3. A four-motioned lfeed dog carried on a IOO stock or bar, combined with operating mechanism consisting of a positively-rotated driving-shaft, a sleeve rotating with and adapted to slide on the driving-shaft, laterally-supported cams h placed loosely on the sleeve and adapted to impart to the feed-dog its necessary movements, and slots m n, the former curved and the latter straight, formed in the sleeve, and engaged, respectively, with studs on the cams w',whereby said cams are caused to rotate with the shaft and sleeve, the curved slot partially rotating the cam h to change its position on the driving-shaft when the sleeve is moved longitudinally, as set forth.

4. The combination of the operating-cam h, the feed-dog-snpporting stock or bar b, having the abutments ff', (the latter being adjustable,) and the rotary shaft fv, journaled at one end in a bearing in the stock or bar and at the other end in the adjustable abutment f', and

having an intermediate threaded portion, of, passing through a threaded socket in the xed abutment, whereby when said shaft is rotated it is moved longitudinally and caused to move the adjustable abutment, as set forth.

5. The combination of the operating-cam h, the feed-dog-snpporting stock or bar b, having the abutmentsff', (the latter being adjustable,) the rotary shaft o, adapted, as described, to move the adjustable abutment, and a rack and pinion for rotating the shaft, as set forth.

In testimony whereof [have signed my name to this specification, in the presence of two subscribing witnesses, this 18th day of February, A. D. 1881.

ALBERT L. PARCELLE.

Witnesses:

G. F. BROWN, H. G. WADLIN. 

